biOrb Grass Ring Aquarium Artificial Plants - Green - M: Fish Decor, 1 Piece

I purchased the biOrb grass ring in two sizes -- small and medium -- to see which would work better for our 4 gallon Baby biOrb. Small grass ring Pro: disguises the air tube and still leaves plenty of "real estate" for the fish to swim around Con: the base of the small grass ring does not fully cover the filter Medium grass ring Pro: covered the base of the filter and looked more "natural" Con: The extra volume of "grass" meant that my poor fish did not have as much room to swim. Given that the Baby biOrb is only 4 gallons in the first place, my final choice was the small grass ring. Although the base doesn't cover the filter, it has just the right amount of fullness to cover the air tube without taking up too much tank space.